i'm having problems killing gevak if anyone can give advice it would be appreciated my guys are aproximately level 18 i have an earlier save where i can go back and level up if that's what i needa do.... but i was just pounding away on him with my 4 main melee all attack, han shooting, cc shooting, riv and the dog using magic and i get annihalated from those stupid monsters while trying to kill gevak i figured not worth bothering with stupid minions... but i donno tips are appreciated!

i had wein go full attack on him with vampire (i think), brett to the south west fighting off incoming warriors, charmaine and xenos to north east fending off others, hans and charlone long range perpetually shooting at gevar or casting raise on any dumb one that dies, and honestly, i didn't do it at 18, i leveled a bit first so not sure if this works for you

There is a Lv 6 gem (Warrior skill, I think) which increases enemy's ATW by normal striking. Gevak's ATW is not short. So my plan is to increase Gevak's ATW sufficiently. Let Hans and Carmine equips this gem. Also anyone of Wein, Xenos, or Lyell equips this gem and a Lv 8 Hyper attack gem (yes, that gem is also effective in sequencial attacks). Then Gevak will need to wait for a long long time to attack your team.

You may not need Lyell. My plan is to decarse Gavak's attack chances. Basically only Wein, Hans, and Carmine should be able to increase Gavak's ATW sufficiently(because these guys have short ATW, basically the shorter ATW these guys have, the longer ATW Gavak has). The major problem I think is that Gavak's ATK and DEF may be a bit too much for Lv 18. So it may not be easy for Wein and Carmine get close to Gavak and it may take a long time to finish Gavak.